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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd2d92ce3d651c376e819eb925b56b07a725aba820a8d1518f78bb0501b01940f' 
  AND token = 'g5zX8MXaASF7M3j4IA18DZDg9Ogf7Jmep+ivIN5viqA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}